Page 1 PROPOSAL FOR HUBBLE SPACE TELESCOPE OBSERVATIONS ST ScI Use Only ID 3254c Report Date: 09-May-96:18:17 Version: ********** Check-in Date: ********** 1.Proposal Title: VISIBLE AND ULTRAVIOLET LIGHT CURVES OF SHORT PERIOD RR LYRAE-TYPE (RRS) VARIABLE STARS-FUTURE ------------------------------------------------------------------------------------ 2. Scientific Category 3. Proposal For 4. Proposal Type 5. Continuation ID STELLAR ASTROPHYSICS GTO/HSP Sub Category ------------------------------------------------------------------------------------ 6. Principal Investigator Institution Country Telephone Robert C. Bless WISCONSIN, UNIVERSITY OF USA (608)262-1715 ------------------------------------------------------------------------------------ 7. Abstract Almost all studies of short-period RR Lyrae stars have mentioned the possibility of small-scale fluctuations in light curves or short time-scale changes in absorption line strengths. While careful examination of high signal-to-noise ratio visible light curves has failed to confirm such behavior, fluctuations may still be detectable in the ultraviolet region. These would reflect such phenomena as shock waves generated by the pulsation in the outer stellar envelope. We propose high time resolution, high signal-to noise ratio observations of a sample of such stars to characterize the ultraviolet pulsation and investigate the pulsation effects in the upper atmosphere. Revision History: Received on RPS 9/1/89; Added to SCCS 9/5/89 RPSS V7.2 remote & local; Small syntax errs fixed - SALM 9/14/89 Move 2 targ to cycle 2 - SALM 3/5/90; Added ANALOG datafmt - SALM 7/11/90; Made changes re team meeting 7/18/90--BJW 7/23/90; Split proposal by cycle-- BJW 3/24/91; ------------------------------------------------------------------------------------ 8. Scientific Key Words: PULSATING STARS, STELLAR ATMOSPHERES, HYDRODYNAMICS ------------------------------------------------------------------------------------ 9. Est obs time (hours) pri: 10.00 par: 0 10. Num targs pri: 4 par: 0 ------------------------------------------------------------------------------------ ------------------------------------------------------------------------------------ ------------------------------------------------------------------------------------ Page 2 I. GENERAL FORM Proposal 3254c PI: Robert C. Bless Proposal Title: VISIBLE AND ULTRAVIOLET LIGHT CURVES OF SHORT PERIOD RR LYRAE-TYPE (RRS) VARIABLE STARS-FUTURE ------------------------------------------------------------------------------------ 1. Proposers: Proposers Institution Country ESA ------------------------------------------------------------------------------------ Robert C. Bless WISCONSIN, UNIVERSITY OF USA G. W. Van Citters NATIONAL SCIENCE FOUNDATION USA Joseph F. Dolan NASA, GODDARD SPACE FLIGHT USA CENTER James L. Elliot MASSACHUSETTS INSTITUTE OF USA TECHNOLOGY Edward L. Robinson TEXAS, UNIVERSITY OF USA ------------------------------------------------------------------------------------ 3. Description of proposed observations. Cycle 0 - One star (AI Vel) in or near continuous viewing zone if possible. Cycle 1 - All others. Total time: 9 hours 16 seconds High time resolution, high signal to noise ratio light curves of short period RR Lyrae stars will be obtained in both visible and ultraviolet wavelengths. The HSP/PRISM mode will be used at 5 second time resolution. ------------------------------------------------------------------------------------ 4. Justification of need for HST observations. See Section 2 ------------------------------------------------------------------------------------ 13. Almost all studies of short-period RR Lyrae stars have mentioned the possibility of small-scale fluctuations in light curves or short time-scale changes in absorption line strengths. These would reflect such phenomena as shock waves generated by the pulsation in the outer stellar envelope. We propose high time resolution, high signal-to-noise ratio observations of a sample of such stars to characterize the ultraviolet pulsation and investigate the pulsation effects in the upper atmosphere. ------------------------------------------------------------------------------------ 11. Address Information Name: ROBERT C. BLESS Category: PI Institution: WISCONSIN, UNIVERSITY OF Address: City: State: Zip Code: Country: Telephone: Telex (or e-mail): ------------------------------------------------------------------------------------ Name: G. W. VAN CITTERS Category: CON Institution: NATIONAL SCIENCE FOUNDATION Address: DIV. OF ASTRONOMICAL SCI. 1800 G STREET, N.W. City: WASHINGTON State: DC Zip Code: 20550 Country: USA Telephone: (202)357-9793 Telex (or e-mail): 982-438 ------------------------------------------------------------------------------------ TARGET LIST a) Fixed Targets ID = 3254c [ 3] ------------------------------------------------------------------------------------------------------------------------------------ 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial |Acqui|FLX| Flux data No | Name | Description | Position |Eqnx | Vel. |Prblm|REF| | | | | | | | | ------------------------------------------------------------------------------------------------------------------------------------ 1 CY-AQR RRS RA = 22H 37M 47.81S +/- 2000 1 V=10.5 0.5", DEC = +01D 32' 4.6" +/- 0.5" ------------------------------------------------------------------------------------------------------------------------------------ 2 DY-PEG ^ RA = 23H 8M 51.14S +/- 0.5", 2000 1 V=10.1 DEC = +17D 12' 56.4" +/- 0.5" ------------------------------------------------------------------------------------------------------------------------------------ EXPOSURE LOGSHEET ID = 3254c [ 4] ------------------------------------------------------------------------------------------------------------------------------------ 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 |10 | 11 | 12 |13 |14| 15 ------------------------------------------------------------------------------------------------------------------------------------ Line | Seq | Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | S/N |Flx|Pr| Special Number | Name | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| |Rel. Time|Ref| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 2.5 CY-AQR HSP/ ACQ 1 4S 1 ^ ONBOARD ACQ FOR 3 VIS CYCLE 2 / 2.5-4 ------------------------------------------------------------------------------------------------------------------------------------ 3 CY-AQR HSP/ PRISM 1.0 F551W/ SAMPLE-TIME=5 ^ 4H 1 ^ VIS F240W ------------------------------------------------------------------------------------------------------------------------------------ 3.5 DY-PEG HSP/ ACQ 1 4S 1 ^ ONBOARD ACQ FOR 4 VIS ------------------------------------------------------------------------------------------------------------------------------------ 4 DY-PEG HSP/ PRISM 1.0 F551W/ SAMPLE-TIME=5 ^ 4H 1 ^ VIS F240W Comments: INTERRUPTIONS BY EARTH OCCULTATIONS SHOULD BE MINIMIZED FOR ALL EXPOSURES. ------------------------------------------------------------------------------------------------------------------------------------ Summary Form for Proposal 3254c [ 5] Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Configurations HSP/VIS ------------------------------------------------------------------------------------------------------------------------------------ Opmodes ACQ PRISM ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters SAMPLE-TIME=5 ------------------------------------------------------------------------------------------------------------------------------------ Proposal for GTO/HSP ------------------------------------------------------------------------------------------------------------------------------------ S/C Hours 10.00 ------------------------------------------------------------------------------------------------------------------------------------ Scientific Category STELLAR ASTROPHYSICS ------------------------------------------------------------------------------------------------------------------------------------ Scientific Sub-category ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements ONBOARD ACQ FOR 3; CYCLE 2 / 2.5-4; ONBOARD ACQ FOR 4; ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements F551W/F240W ------------------------------------------------------------------------------------------------------------------------------------ Target Names CY-AQR DY-PEG ------------------------------------------------------------------------------------------------------------------------------------